Hydrogen absorption kinetics and hydrogen distribution of Ti-6Al-4V alloy
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摘要: 通過Ti-6Al-4V合金750℃條件下的置氫實驗,分析了置氫過程的動力學規律,利用光學金相顯微鏡和二次離子質譜儀研究了保溫時間對氫分布的影響規律.結果顯示,Ti-6Al-4V合金置氫動力學遵循二維擴散機制,滿足Valensi方程g(α)=α+(1-α)ln(1-α),氫在試樣徑向方向的二維擴散是置氫反應的控制步驟.置氫保溫時間大于60min時,氫壓趨于穩定,氫在試樣徑向方向的二維擴散停止,試樣中心的微觀組織和氫離子強度與邊緣的相一致,氫均勻分布于試樣當中.Abstract: The hydrogenated tests of Ti-6Al-4V alloy were carried out at 750℃ and the hydrogen absorption kinetics was analyzed. The effect of holding time on the hydrogen distribution was studied by optical microscope and secondary ion mass spectrometry. The results show that the hydrogen absorption kinetics of Ti-6Al-4V alloy obeys the two-dimensional diffusion mechanism, in agreement with the Valensi equation g(α)=α+(1-α)ln(1-α), and thus the hydrogen diffusion is a rate-controlling step in the diametric direction of the sample. When the holding time is more than 60min, the hydrogen pressure becomes stable, hydrogen stops diffusing in the diametric direction of the sample, and the microstructure and hydrogen ion intensity at the center are the same as those at the brim during hydrogenation process, which proves that hydrogen distributes uniformly within the sample.
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Key words:
- titanium alloys /
- hydrogenation /
- kinetics /
- hydrogen distribution
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